[电子信息工程] 本科论文英文文献翻译3G技术.doc

淮海工学院 外文资料翻译 学 院： 电子工程学院 系（专业）： 电子信息工程 班 级： 电子 061 姓 名： 印苏徽 学 号： 030611136指导教师评语： 签名： 年 月 日一：外文原文 3g technologyalthough the technology behind 3g may seem complicated the ways in which 3g willaffect all of our lives are easy to imagine. just imagine having a combined cameravideocamera computer stereo and radio included in your mobile phone. rich-mediainformation and entertainment will be at your fingertips whenever you want anywherethere is a wireless network.mobile communication is moving from simple voice to rich media where we use moreof our senses to intensify our experiences.but not all of this will happen at once. 3g is an evolution to a communications ideal thatno one completely understands yet. what we do know is that mobile multimedia will hitthe japanese markets in 2001 and europe and north america will follow soon after.3g brings together high-speed radio access and ip-based services into one powerfulenvironment. the step towards ip is vital. ip is packet-based which in simple termsmeans users can be quoton linequot at all times but without having to pay until we actuallysend or receive data. the connectionless nature of ip also makes access a lot faster: filedownloads can take a few seconds and we can be connected to our corporate networkwith a single click.3g introduces wideband radio communications with access speeds of up to 2mbit/s.compared with todays mobile networks 3g will significantly boost network capacity -so operators will be able to support more users as well as offer more sophisticatedservices.3g - at home3g is going to affect our home and social lives in many ways. the services that 3genables will help us to manage our personal information simplify tasks such as groceryshopping make better use of our time and offer services that are just fun to use.operators will be able to develop myriad new service opportunities to attract and retainnew customers. here are some examples: youre sitting on a train and use this quotdeadquot time to log on to your bank account check your balance and pay a few bills - all through your 3g device. you save time and can be smarter about managing your finances. on a touring vacation you arrive in a new city. you havent made any reservations in advance because you can do this when you get there by using your 3g handset to obtain up-to-date information including hotel vacancies. having booked a room you can use your mobile to view video clips of local tourist attractions and talk to someone from the local tourist information bureau at the same time.3g - at work3g will not just support the needs of businesspeople who travel a lot but will also helpnew flexible working practices such as home-working and remote access to corporatenetworks outside traditional working hours. businesspeople are often high-volumeairtime users so they represent a big opportunity for mobile operators. here are someexamples: at work you receive a message from your quotsmartquot refrigerator at home. the message tells you that certain items need restocking and an order has already been prepared for the local grocery store which you can approve so that your groceries are ready to collect on the way home. you are on the road and urgently need to discuss a draft presentation with a number of colleagues back in the office. pulling into a service station you use your 3g device to hold a telemeeting with your colleagues and at the same time you can all view the draft presentation and make changes on line. a maintenance engineer is repairing some equipment on a clients premises and hits a problem. using his 3g device he contacts his department and downloads a demonstration video that guides him through the repair process.technology3g brings together two powerful forces: wideband radio communications and ip-basedservices. together these lay the groundwork for advanced mobile internet servicesincluding personalized portals quotinfotainmentquot mobile commerce and unified messaging-encompassing high-speed data superior quality voice and video and location-basedservices.making 3g a reality depends on technology developments in different areas. theseinclude amendments to the radio interface to support wideband communications and inthe core network. supporting technologies such as wap and bluetooth also have animportant role to play. this section provides a brief overview of some of the maintechnologies and developments involved. ericsson supports all of these technologies andhas played an active role in their development. gprsgeneral packet radio service gprs is an enhancement to existing gsm and tdmanetworks that introduces packet data transmission enabling quotalways onquot mobility. thismeans that users can choose to be permanently logged on to e-mail internet access andother services but do not have to pay for these services unless sending or receivinginformation. when edge is added to gprs these data rates will increase up to384kbit/s.gprs will be implemented by adding new packet data nodes and upgrading existingnodes to provide a routing path for packet data between the mobile terminal and agateway node. the gateway node will provide interworking with external packet datanetworks for access to the internet and intranets.benefits: faster data speeds and quotalways onquot mobility almost instantaneous connection set-up connection to an abundance of data sources around the world through support for multiple protocols including ip a step towards full 3g services. wcdmawideband code division multiple access wcdma is a wideband radio technique thatprovides far higher data rates than other radio techniques available today up to 2mbit/sand highly efficient use of radio spectrum.the higher bandwidth that wcdma provides will deliver the full potential of 3g. forexample wcdma allows simultaneous access to several voice video and data servicesat once.wcdma is fully compliant with imt-2000 and is the air interface technology forstandards in the 2ghz bandwidth the imt-2000 core band known as umtsuniversal mobile telecommunication system in europe and arib association ofradio industry businesses in japan.ericsson has been at the forefront of wcdma development. the company delivered anexperimental wcdma system to ntt docomo in japan back in 1998. ericsson hasalso set up wcdma test systems around the world. at 2000 ericsson announced its firstfamily of wcdma base stations. edgeenhanced data rates for global evolution edge enables gsm and tdma operatorsto offer 3g services using existing network frequencies. by making changes andadditions to standardization of evolutionary phases of the air interface and the backbonenetworks as well as the migration to all-ip and multimedia networks. cdma2000cdma2000 is a decidedly efficient 3g standard for the delivery of high bandwidth dataand high capacity voice services. the evolution of the cdma2000 standard will enablemobile systems to offer data throughputs of 2 mbit/sec and beyond.the higher bandwidth that cdma2000 provides will deliver the full potential of 3g. forexample cdma2000 also allows simultaneous access to several voice video and dataservices at once.cdma2000 is fully compliant with imt-2000 requirements for 3g. cdma2000 will beimplemented in the existing frequency bands of cmda and tdma at 800 and 1900mhz as well as in new spectrum at 2ghz in japan.ericsson is a leader in cdma2000 development and a key driver in the standardization ofevolutionary phases of the air interface and the backbone networks as well as themigration to all-ip and multimedia networks. bluetoothbluetooth is an open standard for two-way short-wave radio communications betweendifferent devices. it marks the end of cables and cords between mobile phones palmtopsportable pcs and printers for example. furthermore bluetooth enables informationbetween such devices to be synchronized. diary information held on a pda can beupdated automatically when within range of a bluetooth-enabled pc. bluetooth is alsogoing to be important for machine-to-machine communications - one of the largestgrowth areas in telecommunications.bluetooth is a key development for terminals and other devices using mobile networks. itis available now for 2g networks and as 3g systems will play an increasingly importantsupporting role in the future of mobile communications. ericsson has already announcedbluetooth devices including the t36 bluetooth phone and a bluetooth headset.bluetooth was originally developed by ericsson but is now under the auspices of thebluetooth special interest group. it has widespread support among telecom equipmentvendors computer and chip manufacturers. symbiansymbian is an independent joint venture supported by companies including ericssonnokia motorola and psion. symbian aims to promote a mass market for mobileinformation devices in two ways: first through the development of core software application frameworks applications and development tools for mobile multimedia devices such as pdas smartphones and communicators second by quotevangelizingquot standards for the interoperation of mobile information devices. symbians epoc operating system is already available and ericsson devices such as the r380 are epoc-enabled. wapwireless application protocol wap is a global open standard that gives mobile usersaccess to internet services through handheld devices. it enables users to easily access awhole range of mobile internet and other data services from mobile devices such assmartphones and communicators and without the need to plug into a separate laptop ordata-enabled device.wap enables this through a built-in quotwap microbrowserquot that lets information beaccessed direct from a phone in the same way that web browsers provide access toon-line services via an internet-ready pc. typically a wap screen will display a numberof hyperlinks to various services or information portals.as well as wap phones ericsson has also announced a wap service developers kitwapide and the wap gateway/proxy which bridges wap applications and servicesin internet and intranet environments with mobile networks. in addition ericssonprovides application enablers such as ericsson localized internet eli forlocation-based services and wap application server was providing a run-time anddevelopment environment for wap applications.ericsson is one of the four founding members of the wap forum. since 1997 when itwas established the wap forum has gained widespread industry support - hundreds ofcompanies are members of the worldwide wap forum。 the latest version of the wapstandard wap 1.2.1 has recently been launched.our dedicated wap consutants are ready to assist operators and service providerssharpen their competitive edge. they help todays businesses adapt to the new economyand create cost-effective innovative ways to communicate with customers.二：外文资料翻译译文 3g技术 虽然在 3 g 后面的技术可能很复杂 但是3 g 将会在我们生活中产生的影响是我们可以想象的。 仅仅想像在你的行动电话中加入照相机、摄像机、计算机、音响以及收音机功能。这样，无论何时何地你都将能够通过无线网络获得大量的媒体信息和娱乐。 移动通信正在由单一的语音通信向多媒体方向发展通过此途径来加深我们对外界的感觉。 但不是这全部都将立刻发生。至今为止没有一个人能够完全掌握3g的发展的进程。我们唯一确信的是2001年多媒体移动通信将冲击日本市场，而且欧洲和北美也将很快发展多媒体通信市场。 3g在带来高速的语音通路之外还集以ip为基础的服务为一身有强大的发展环境。向ip方向发展是至关重要的。ip技术是以简单的数据包传输为基础的 可以使用户同时上网，但是不必花钱除了我们发送或接收数据。 ip 的自然无连接性可以大大提高存取速率: 文件下载只需要很短的时间，而且只需轻轻一点就能和网络连接上。 3g采用多频率通信技术并且达到 2 mbit/s 的通路速度。与现在的移动网络相比较3g将会极大的提高网络容量-因此将能够支持更多的使用者 同时能够提供更多复杂的服务。3 g - 在家庭中的应用 3g将通过许多途径影响我们的家庭和社会生活。3g服务将为我们管理个人信息提供帮助简单的任务例如在食品杂货店如何合理的利用时间来提高我们的服务就是非常生动的应用?经历将可以提出许多新的服务项目来吸引新顾客留住老顾客户。在这里有一些例子: 你可以利用乘坐火车的时间登录你的银行帐号 检查你的收支是否平衡还可以支付一些帐单 所有的这些都得通过3g实现。 你在节约时间的同时整理了你的财物。 在休闲度假中，你倒了一个新城市。 你没必要作任何的预订，因为你可以在到达之后再做这些，通过3g手机你能获得最新的信息，包括旅馆空缺。有预订房间你可以使用你的手机查阅当地的旅游胜地还可以同时与别人交流旅游信息。3 g- 在工作中的应用 3g将不仅仅满足很多经常出差的商人的需要也将会有助于新兴的、轻松的工作，例如你可以在家通过网络进行贸易。商人是关注电视节目实际间最长的人，因此，他们为手机的设计者描述了一个很大的商机。以下是一些例子: 在工作中你受到家中quot 智能 quot 电冰箱的一个信息。信息告诉你，冰箱中的一些事务需要更换了，并且这些需要的东西的清单已经准备发往杂货店如果你同意杂货店将为你准备搞所有的东西。 你在旅途中急切地需要与在办公室中的同事讨论草稿发表。到一个服务车站你使用你的 3 g 装置和你的同事举行电话会议与此同时，你能看到全部草稿的发表而且在线上做出相应的变化。 一个维护工程师正在修理在客户提出的一些仪器并且遇到了问题。使用3 g 装置与他的部门连络，下载的修理程序将示范录象机指导他修理。技术 3 g有二个有利的优势: 宽带语音通信和以 ip 为基础的服务。综合在一起，这些为